Find an equation for the nth term of the arithmetic sequence.

-13, -8, -3, 2, ...

an = -13 x 5(n - 1)
an = -13 + 5(n - 1)
an = -13 + 5(n + 2)
an = -13 + 5(n + 1)

Respuesta :

The answer is the second answer choice, an = -13 + 5(n - 1)

Answer:

Option B.

Step-by-step explanation:

The given arithmetic sequence is

[tex]-13,-8,-3,2,...[/tex]

We need to find the nth term of the given arithmetic sequence.

Here,

First term : [tex]a=-13[/tex]

Common difference : [tex]a_2-a_1=-8-(-13)=-8+13=5[/tex]

The nth term of an arithmetic sequence is  

[tex]a_n=a+(n-1)d[/tex]

where, a is first term and d is common difference.

Substitute a=-13 and d=5 in the above formula.

[tex]a_n=-13+(n-1)5[/tex]

[tex]a_n=-13+5(n-1)[/tex]

Therefore, the correct option is B.